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A childhood belief about counting

It always confused me when my mom would ask someone what "percent" certain they were, and they would answer 80% or 90%. I thought, if you're certain, you're certain, and these people all must have an agreed upon number that would mean they are certain. Finally, my mom asked me the question one day, and I asked her "out of what number?" I thought it was a perfectly intelligent question (since the number could be anything) and she said 100. So I was 100% certain. What bothered me though, was that I would still hear other people quote other percents, yet my mom always told me the number was 100. It took me a while to realize you didn't always have to be 100% certain!

— CB

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